奥氏体化温度对高碳含硅钢等温转变的影响

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Abstract The influence of austenitization temperature on the incubation period and the bainitic phase transformation behaviour in high-carbon silicon steel has been investigated using X-ray diffraction (XRD), optical microscopy and transmission electron microscopy (TEM). The microstructure characteristics of the isothermal transformation (240 ℃, 20 min) products were also studied. It was found that the nose temperature of bainite transformation and incubation period decreased with the increasing austenitizing temperature. After isothermal heat treatment at 240 ℃ for 20 min, all samples were austenitized at different temperatures produced a bainitic structure, which consisted of packets of parallel ferrite laths. However, notable differences in sub-structure were found among these samples. When it was austenitized at lower temperature, the major difference lied in the edge boundary morphology. Bainitic laths formed in low-temperature austenitizing conditions had sharp saw-tooth edge boundaries, whereas bainite transformed from high-temperature austenitizing conditions had smooth wedge boundaries. The observed bainite packets did not possess the twin substructure of quenched martensite and its corresponding strain accommodation microstructure. The formation of packet bainitic structures investigated in this study cannot be simply explained by martensitic displacive transformation mechanism. Further research is required to clarify the baintic transformation mechanism.

Key words： austenitization temperature incubation period nose temperatures packet bainite structure edge boundary

Received: 16 December 2013 Published: 14 July 2014

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	LIU Qiang-Suo
	YUAN Lian-Jie
	YANG Wei-Wei
	GAO Bin
	MENG Liang

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LIU Qiang-Suo,YUAN Lian-Jie,YANG Wei-Wei等. Effect of Austenitizing Temperature on the Bainitic Transformation Behaviour in the High-Carbon Silicon Steel[J]. Iron and Steel, 2014, 49(7): 94-100.

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http://www.chinamet.cn/Jweb_gt/EN/ OR http://www.chinamet.cn/Jweb_gt/EN/Y2014/V49/I7/94

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